xrt91l31 Exar Corporation, xrt91l31 Datasheet - Page 27

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xrt91l31

Manufacturer Part Number
xrt91l31
Description
Sts-12/stm-4 Or Sts-3/stm-1 Sonet/sdh Transceiver
Manufacturer
Exar Corporation
Datasheet

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REV. 1.0.0
The PISO is used to convert 77.76 Mbps or 19.44 Mbps parallel data input to 622.08 Mbps STS-12/STM-1 or
155.52 Mbps STS-3/STM-1 serial data output respectively, which can interface to an optical module. The
PISO bit interleaves parallel data input into a serial bit stream taking the first bit from TXDI7, then the first bit
from TXDI6, and so on as shown in
F
3.5
IGURE
t
t
TXPCLK_IO
TXPCLK_IO
t
t
t
t
S
S
TXPCLK_IO
TXDI_SU
TXDI_HD
TXDI_SU
TXDI_HD
15. S
Transmit Parallel Input to Serial Output (PISO)
YMBOL
YMBOL
TXDI n+
TXDI7
TXDI0
TXDI n
T
T
ABLE
ABLE
IMPLIFIED
b
b
b
b
14: A
n+
0
n
7
15: A
8-bit Parallel LVTTL Input Data
7
7
7
7
b
b
b
b
n+
0
n
7
6
6
6
6
b
b
b
b
LTERNATE
n+
0
n
7
LTERNATE
5
5
5
5
B
b
b
b
b
n+
0
n
7
Transmit data setup time with respect to TXPCLK_IO
Transmit data setup time with respect to TXPCLK_IO
LOCK
4
4
4
Transmit data hold time with respect to TXPCLK_IO
Transmit data hold time with respect to TXPCLK_IO
4
b
b
b
b
n+
0
n
7
3
3
3
3
b
b
b
b
n+
0
n
7
2
2
2
D
2
b
b
b
b
T
IAGRAM OF
n+
0
n
7
T
1
1
1
RANSMIT
1
RANSMIT
b
b
b
b
n+
0
n
7
0
0
0
0
Transmit Clock Input period
Transmit Clock Input period
Figure
77.76 MHz (STS-12/STM-4) or 19.44 MHz (STS-3/STM-1)
P
P
P
P
PISO
15.
ARALLEL
ARALLEL
ARAMETER
ARAMETER
STS-12/STM-4 OR STS-3/STM-1 SONET/SDH TRANSCEIVER
time (0)
D
b
D
7
27
0
ATA
ATA
b
6
0
b
I
5
NPUT
I
0
NPUT
b
4
155.52 Mbps STS-3/STM-1 serial data rate
0
b
3
0
T
622.08 Mbps STS-12/STM-4 or
T
b
IMING
2
IMING
0
(STS-12/STM-4 O
(STS-3/STM-1 O
b
7
7
b
6
7
M
M
2.0
1.0
2.0
1.0
b
5
7
IN
IN
b
4
7
b
3
7
12.86
51.44
b
T
T
2
7
YP
YP
b
PERATION
PERATION
1
7
b
0
7
XRT91L31
M
M
AX
AX
)
)
TXOP/N
ns
ns
ns
ns
ns
ns
U
U
NITS
NITS

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